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本帖最后由 jjlamshushushu 于 2014-1-6 11:57 编辑
* J0 e$ j+ l5 `; G- Vhead0819 发表于 2014-1-6 11:03 6 M. Y3 e8 K/ b" y# V$ A6 f
28章节短路一分钟记下的是最大输出电流,33章节是变压器过载的测试。 过载测试先从condition A开始, condi ...
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2 _; N8 ?2 C, ?table 9 里的 condition B--Rectifier to cause half wave rectified short circuit 如何操作?
% J( m( [0 T9 Y* u% i3 S! D! H对表9中这段话如何理解?--- If the maximum available secondary winding current of
" ~2 F+ k7 @! |. f; u6 X, Ba transformer is considered to comply with the maximum allowable* ^. G k3 @3 V: y; o" z3 R
current limitation and it is impractical to obtain the one minute current value for this test, & i, x, u2 H3 @' C
the maximum measured secondarycurrent value at the time of coil burnout, or 8 A, v9 N: J* M4 g9 V c B
may be used to determine the overload test conditions.
9 A; t7 r2 q, x+ U% ^- F. \( ^也就是说按照条件A--I,每个条件阶段持续7小时,其实条件A的过载电流=I +(I max-I) X100%=I max& A3 U" a) M/ | Y; M2 j# I5 o
即:只考量I max 不大于限值8A就可以替代其他过载测试条件了。是这样理解吗?" K! D% G. n- b& Q0 z' n v
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